The following products presented in this data sheet are being withdrawn: B39461B3578U310 Date of withdrawal: Deadline for last orders: Last shipments: 22-DEC-04 31-MAR-05 30-JUN-05 For further information please contact your nearest EPCOS sales office, which will also support you in selecting a suitable substitute. The addresses of the sales offices are given on the Internet at www.epcos.com/sales. 1 SAW Components Data Sheet B3578 SAW Components (B3578) Low-loss Filter 463,70 MHz Data Sheet Ceramic package QCC8C Features RF low-loss filter for remote control receivers Package for Surface Mounted Technology (SMT) Balanced and unbalanced operation possible Terminals Ni, gold plated typ. dimensions in mm, approx. weight 0,1 g Pin configuration 1 2 5 6 4,8 Input Ground Input Output Output Ground Case - Ground 3,7 to be grounded Type Ordering code Marking B3578 B39461-B3578-U310 C61157-A7-A56 Packing according to F61074-V8070-Z000 Electrostactic Sensitive Device (ESD) Maximum ratings Operable temperature range TA Storage temperature range DC voltage Source power Tstg VDC PS -40/+95 C -40/+95 0 10 C V dBm 2 source impedance 50 Nov 28, 2002 SAW Components (B3578) Low-loss Filter 463,70 MHz Data Sheet Characteristics Reference temperature: Terminating source impedance: Terminating load impedance: TA = -40 ... 95 C ZS = 50 and matching network ZL = 50 and matching network min. typ. max. -- 463,70 -- Minimum insertion attenuation min 463,57 ... 463,83 MHz -- 1,9 3,2 dB Pass band (relative to min) 463,57 ... 463,83 MHz 463,52 ... 463,88 MHz -- -- 0,8 1,0 2,0 3,0 dB dB fC Center frequency (center frequency between 3 dB points) Relative attenuation (relative to min) 10,00 ... 443,00 443,00 ... 453,50 453,50 ... 461,70 461,70 ... 462,70 MHz rel MHz MHz MHz MHz 48 44 30 12 53 49 35 15 -- -- -- -- dB dB dB dB 464,70 ... 471,70 MHz 471,70 ... 550,00 MHz 550,00 ...1000,00 MHz 15 40 45 18 45 50 -- -- -- dB dB dB -- -- || pF -- 168 || 2,60 164 || 2,80 -- || pF Impedance for pass band matching Input: ZIN = RIN || CIN Output: ZOUT = ROUT || COUT Temperature coefficient of frequency 1) TCf -- -0,03 -- ppm/K2 Frequency inversion point T0 5 -- 25 C 1)Temperature dependence of fC: fC(TA) = fC(T0) (1 + TCf(TA - T0)2) 3 Nov 28, 2002 SAW Components (B3578) Low-loss Filter 463,70 MHz Data Sheet Matching network to 50 (element values depend on pcb layout and equivalent circuit) Cp1 = 1,2 pF Ls2 = 27 nH Ls3 = 27 nH Cp4 = 1,2 pF Minimising the crosstalk For a good ultimate rejection a low crosstalk is necessary. Low crosstalk can be realised with a good RF layout. The major crosstalk mechanism is caused by the "ground-loop" problem. Grounding loops are created if input-and output transducer GND are connected on the top-side of the PCB and fed to the system grounding plane by a common via hole. To avoid the common ground path, the ground pin of the input- and output transducer are fed to the system ground plane (bottom PCB plane) by their own via hole. The transducers' grounding pins should be isolated from the upper grounding plane. A common GND inductivity of 0.5nH degrades the ultimate rejection (crosstalk) by 20dB. The optimised PCB layout, including matching network for transformation to 50 Ohm, is shown here. In this PCB layout the grounding loops are minimised to realise good ultimate rejection. Optimised PCB layout for SAW filters in QCC8C package, pinning 2,5 (top side, scale 1:1) The bottom side is a copper plane (system ground area). The input and output grounding pins are isolated and connected to the common ground by separated via holes. For good contact of the upper grounding area with the lower side it is necessary to place enough via holes. 4 Nov 28, 2002 SAW Components (B3578) Low-loss Filter 463,70 MHz Data Sheet Normalized frequency response Normalized frequency response (wideband) 5 Nov 28, 2002 SAW Components (B3578) Low-loss Filter 463,70 MHz Data Sheet Published by EPCOS AG Surface Acoustic Wave Components Division, SAW CE AE PD P.O. Box 80 17 09, D-81617 Munchen EPCOS AG 2001. All Rights Reserved. As far as patents or other rights of third parties are concerned, liability is only assumed for components per se, not for applications, processes and circuits implemented within components or assemblies. The information describes the type of component and shall not be considered as assured characteristics. Terms of delivery and rights to change design reserved. For questions on technology, prices and delivery please contact the sales offices of EPCOS AG or the international representatives. Due to technical requirements components may contain dangerous substances. For information on the type in question please also contact one of our sales offices. 6 Nov 28, 2002